This software doesn't keep me employed.
...
where we are essentially forced to upgrade or die,
You can't have it both ways.
Without the software, your skill is just so much thin air, as you say without the software you die.
If you don't like it, don't buy it. But wait, all your clients use it, so for you to MAKE MONEY, you need to use it, too. Oops, your clients upgraded, for you to continue to MAKE MONEY, you need to upgrade, too. It's called "cost of doing business".
The costs for keeping up with AutoCAD releases aren't anywhere near the costs of maintaining employee salaries in the last 20 years, but let's don't complain about that. Heck the cost of maintaining the software is nowhere near the cost of maintaining the hardware for that matter. Hey, you can be just as productive using a little slower machine, with one 19" monitor. Let's lose the sound card and speakers, all the frills, no internet access, just yer basic stripped down CAD terminal. Do that and wait for the whining to begin.